The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 19 |
| 5 | 39 |
| 6 | 81 |
| 7 | 168 |
| 8 | 350 |
| 9 | 729 |
| 10 | 1516 |
| 11 | 3154 |
| 12 | 6561 |
| 13 | 13647 |
| 14 | 28388 |
| 15 | 59049 |
| 16 | 122827 |
| 17 | 255490 |
| 18 | 531441 |
| 19 | 1105442 |
| 20 | 2299412 |
| 21 | 4782969 |
| 22 | 9948976 |
| 23 | 20694705 |
| 24 | 43046721 |
| 25 | 89540788 |
| 26 | 186252345 |
| 27 | 387420489 |
| 28 | 805867092 |
| 29 | 1676271101 |
| 30 | 3486784401 |
| 31 | 7252803827 |
| 32 | 15086439912 |
[1,2,4,9,19,39,81,168,350,729,1516,3154,6561, 13647,28388,59049,122827,255490,531441,1105442, 2299412,4782969,9948976,20694705,43046721, 89540788,186252345,387420489,805867092,1676271101, 3486784401,7252803827,15086439912] |